Fire-control apparatus for naval guns



Oct. 20, 1925. 1,557,545

w. AKEMANN FIRE CONTROL APPARATUS FOR NAVAL GUNS Filed March 5, 1924 2Sheets-Sheet 1 W. AKEMANN FIRE CONTROL APPARATUS FOR NAVAL GUNS FiledMarch 5. 1924 2 Sheets-Sheet 2 35' ment, which is Patented. Oct. 20,1.925.

UNITED STATES PATENT OFFICE."

WALTER AW, 01' BERLIN-HARLEM, GERMANY, ASSIGNOB TO FRED. KBUP PAKTIENGFSELLSCHAFT, F ESSEN-GN-THE-RUHR, GERMANY.

V FIREQONTROL APPARATUS FOR NAVAL GUNS.

Application filed amen a, 1024. Serial no. macs.

a To allwhomit may concern. I p

' Be it known that I, WALTHER AKEMANN, 1 residingat Berlin-Dahlem,Germany, a-citizen of the German Republic, have lnvented I a certain newand useful Improvement in Fire-Control Ap aratus for Naval Guns, of Iwhich the followm is a specification. The invention re ates to a firecontrolapparatus for naval guns which is provided with a firing devicehaving a stabilized and a non-stabilized firing tongue, and with a longdistance adjusting a paratus enabling the distant pointing of the gun.The object of the invention is to so improve apparatus of the characterstated that a particularly advantageous connection is attaindbetween thefirmg device and the long distance transmittm apparatus which latter isdesigned for t e dlstant pointing of at least one gun.

With this end in View the invention consists in the arrangement,construction and combination of parts to be hereinafterdescribed andparticularly pointed out in the appended claims. I.

The invention will now be described in detail with reference to theaccompanying drawing-which diagrammatically illustrates, by way ofexample, twoembodiments of the subject-matter of the; invention and inwhich: .Fig. 1 illustrates and Fig. 2 that portion of the secondembodisituated in the transmitting the first embodiment,

station. J

.The embodiment described first.

' The gun-barrel' A is mounted in the shown in Fig. 1 will be and isprovided with a toothed elevating are having a series of teeth a andanother series of teeth (1 The teeth a are engaged a inion which ispositively connected to a s aft 6 by means of a self-locking worm gear 6a". The other teeth, a in mesh with a pinion a of afgear a? a 0 areconnected to a shaft C designed for adjusting a rotatable reading-01fmark 0 which indicates the elevation of the n-barrel 1L The rotation othe shaft 6 can be ef fected y a distant controlled receiving mo- 7self-locking latter is beigig e use of after the clutch f" for B or by ahand wheel B mounted on the free end of shaft 6 A quickly releasableclutch b is interposed between the motor B and the worm b. v

The armature, not shown, of the receiving motor B excited by alternatingcurrent, is connected by conductors b to the corres ondin transmitter Dexcited bysimilar ternatmg current in such a manner that it, runssynchronously with the rotative part, formed by the brushes d of thetransmitter D. The rotatable brushes (1 are mounted on one end of ashaft (1 the other positively connected to one, 6, of thevv'central.

means of 8.

Wheels of said lanet ear b p g while the shaft f is positively connectedto the other central wheel 7" of said gear. The shaft e is furtherprovided with a hand wheel E and a reading-off device e e indicating thedis-' tance target-gun. For rotating the shaft f ,there is provided, inthe first line, a continuous current motor F which may be connected to anetwork by a switch P- and the armature of which is positively connectedto the shaft 7 through the intermediary of a self-locking gear f g f f ff and a quickly releasable clutc f.

line, there is provided a hand wheel f which is mounted on the free endof shaft j and rotates idly with this shaft if the driven by the motor Fand which is 111 has been th ownout. The rotation of the shaft f isfurther transmitted, by a gear I 40 mounting A capable of lateraltraining; f" g, to a shaft gwhich carries on its free end brushes 9forming the rotative parts of a transmitter G.- To the said brushes g ofthe transmitter G which is exclted by In the second alternating current.is so connected by conductors g the armature of the correspondingreceiving motor H excited by simllar alternating current, that it willrotate synchronously with said brushes g. The arma-' ture shaft h is'positivelyconnected by a worm gear 15 i to the casin J of agyro scopefiring device, which casmg is adapted toswing about an horizontal axis.This lbeingstab" Ontheshaft bythein w e the counter-tongue k, is vjustablyz mounted on a art K which is capable of in the space bysald'gyroscope. The adjustability of the countertongue! 1: which doesnot form the subject matter of this invention and, therefore, is notillustrated here, is broadly shown in the ification of U. S. Patent No.1,387,440.

0 said adjustability enables the influence of the velocity of the rollon the angle 0L axis of advanced ignition and therewith on the angle ofelevation tobe automatically al lowed for at the moment of the shot. The

conditions are so chosen that with each angle of rotation of the shaft fthe a les of rotation imparted tothe glm-barr fA and to the tongue i areual to each other. g is a reading-oft device f" f in 'cating therotations imparted to the gun:barrel and to the tongue i by thereceivers B and H.

The two firing tongues 13 and H lie --in a circuit-which comprises theexciting winding M of the firing ma et and a hand-operated switch N. Asha q, further, is sitively connected to the shaft d by a evel d g, saidshaft 2 driving the transgear 39 mitter Q which is provided with areadingofl device, of a long distance indicatingapparatus. The receiverQ belonging to sald Q and connected thereto by conductors 9 shows apointer g indicating its adjustment and the axis of rotation of whichcoincides with that of the mark 0 The working of the above-describedapparatus will be described from the position oi the parts as seen inthe drawing and it 10 will supposed that the gyroscope is and the shipassumes an horizontal position. Now, when the ship is rolling and thegun-barrel A which lpreviously has been laterall trained is to aveimparted ovation corresponding to the range of the target with respectto an horizontal plane and has to be fired, to its passing, during theroll, throu the horizontal position by an amount 0 time nding to thedelay then first thehand wheel E is turn until the division mark of thescale 0" correspondi to the of the target, registers with t e mark a.rotation of the hand wheel E causes, of the gear 0* e' e e e 21 arotation of the shaft d eihfectl'1 llh its urn, acorresponding' rotationo t e ru es d, which form the rotative Part of the transmitter D, and bymeans 0 the gear (1 also a rotation of they rotative part of the Q. Therotation of the rotative parts of the transmitters D and Q iscorrespondingly taken part in by the armature of the receivin motor Band by the rotative pointer g o the receiver Q of the rior' longdistance indicating apparatus Q Q.

Further, the said rotation of the armature of the receiving motor B ofthe long distance adjusting apparatus D b B is transmitted, firstly, bymeans of the gear I) b b a a a a to the un-barrel A in such a mannerthat an elevation corresponding to the range of the target is impartedto the latter relative to its platform. Secondly the said rotation istransmitted, byv means of the gear a a a 0 C, to the mark a rotatableabout the pointer 9 The conditions are so chosen t at every rotation ofthe shaft d causes rotations of the pointer g and of the mark 0whichrotations are equal to one another. In consequence thereof thepointer gand the mark a will permanently register, upon rotation ofshaft d, as long as the long distance adjusting apparatus D d b B andthe long distance indicating apparatus Q g Q 9 will work normally.

In addit1on to'the said elevation imparted to the gun-barrel by turninthe hand wheel E and corresponding to t e range of the target, aninclination by a determined angle, or instance 3, is imparted to thegun-barrel A and to the non-stabilized firing tongue 2'. To this end,afterthe clutch f,

has been thrown out, the hand wheel f is turned until the reading-offmark m ca e istcrs with that division, mark of t e s f" which indicates3. This rotation of the 7 hand wheel f *is transmitted, firstly, by

means of the intermediate gears shown 1nthe drawing to the adjustableparts of the transmitters. D and G and causes, by means" of thereceivers B and H a corresponding additional adjustment of thegun-barrel A and ot' the nonrstabilized tongue i. The conditions aresuch as to cause, u on the r0:

tati'on just mentioned of the ban wheel f,

the gun-barrel A and the tongue 2? to turn by 3 in counter-clockwisedirection and to be lowered by 3 relative to their previous angularposition. The described rotation of the hand wheel f is transmitted,secondly, by means of the long distance indicating apparatus Q Q to thepointer and so 1marts to it an adjustment that it permanenty willregister with the mark 0 which like- -wise alters its angular positionupon lower- ?ing the gun-barrel A. Therefore the gunbarrel A adjustedrelative to its platform I and taking part in the rolling movements ofthe shi assumes in the moment of passing throng its horizontal position,anangle of elevat1on,,relative to its platform, which is by 3 smallerthan the angle of elevation corresponding to the range of the target,and thefiring tongue 71 likewise'taking part in the roll assumes in thismoment still an angular distance from the tongue is which is emlual tothe angle of 3 minus the amount of t e angle of advanced ignition.

Now as hereinbefore explained, th s fire tongu has to" be initiatedprior to the assage through the horizontal position y the amount of theangle of advanced ignition corresponding to. the firing delay. It is 6therefore required to impart, during the rolling-up movement, to therolling tongue 71 and to the gun-barrel A, likewise rolling, anadditional rotation by 3". This additional rotation by ,3? causes thetongue to face the tongue 10 at the moment the ship is in advance of thehorizontal position by the angle of "advanced ignition, and the gunbarrel A to assume an angle corresponding to the ran e of the target atthe moment 5 of the horizontal position of the ship.

As soon as the hereinbefore described ailjustments, by the hand wheels Eand f, u of the gun-barrel and tongue i have been terminated, the clutchf is thrown in. If now the ship takes the lower reverse point of themovement of roll or is in the vicinity thereof, first the switch" Ncontained in the firing circuit, is thrown 'in by hand. Then, duringthemovement of roll directed to' Y wards the horizontal position thecontinuous current motor F is set in motion by throw- Y ing in theswitch f The rotatlon of motor F which takes place with a uniformangular velocity after a constant starting time,

r is transmitted by means of-the' gear f "f f f" f f to the. shaft 7 andtherewith, in the manner already described, also to the rotativeparts ofthe transmitters D, Q, and G. The gun-barrel A which is positivelyconnected to the armature of the receiver B and the firing tongue 71positively attached to the receiver H' will therefore be rotated withequal angular. velocity in clockwise directim. The conditions are sothat, the

I e iturnetbinclockwise direction by the motor F will face again thestabilized tongue is, during the upwardly Idirected nfovement of roll,in a moment in, which the ship is-Lstill inclined relative to itshorizontal position by. the angle of advanced ignition, and that thetongue 2' will again assume, its angular position shown in the dfiawi'ngrelatiye to the tongue when the s 'ip is inhori'z'ontal position. Thusthe firing tongue. 1? has been rotated, during the rolling-up movement,until the horizontal positionhas been reached, by 3? in clock wisedirection by the motor F. As the angular velocities of the tongue 2' andof the gun- 5 barr, l are equal to one another, the gun'- barrelhasvbeen raised,- during the rollingup, until the horizontal positionhas been reached, by 3 relative'to its platform and therefore assumesagain in this moment the elevation corresponding to the range of thetarget relative to its platform. When the tongues 71 and k touch eachother and thus close the firingcircuitcontaining the winding M-of the.firing magnet, the shot is ef- 55 fe'cted automatically; The projectilethus leaves the gun-barrel in accordance withthe firing delay mentioned,in that moment p where the ship passes through the horizontal positionand where the gun-barrel has again the elevation corresponding'to therange of the target. As soon as the shot has beena fired the motor F isstopped. In case it happens, afterthe recoil following the shot, of thegun-barrel A, that the elevation of the latter has undesirably altereditself by 75 a small amount and that consequentlythe 1 mark a "will nolonger register with the s pointer q, the clutch b is thrown out, the

gun-barrel is; brought into the required ele-r vation by turningth'ehand wheel B .and the clutch b is then thrown in again.

The above-described inclination by 3 of the gun-barrel A and of thenon-stabilized tongue a? is performed in order to render it possible,upon the rolling-up of the ship, to get the passage of the tongue 5partaking in the roll, past the stabilized tongue H, with a velocitywhich is by a constant amount greater than the relative velocity of thetongues i and k provoke by the velocity .of roll otthe ship. For, thisincrease ofthe rotative Velocity of the tongue 71 by a constant amountis suitable with regard to the properties of the mechanism, not shown,

forautomatically regulating the angle of advanced ignition (mechanismfor automatically adjusting the tongue 70 relative to the Cardan .ring.K) and is even necessary with little velocities of roll. For, thismechanism which does not form the object of the invention and thereforeis ,n ot described, works in a satisfying manner only if thenon-stabilizable tongue i will be moved: past the stabilizable ton uewith a practically-uniform velocity w iich does not exceed determinedupper and lower limits. The main advantage of the resent invention restsin'that it is possi le to set the non-stabilizable tongueindependentlypf the gun-barrel or in common therewith. For, thispossibility is the presupposition for the mode of adjusting pointed outin the foregoing as being of particular advanta e.

it further important advantage resides in the fact that the gyroscopedevice carrying the firing device is not fitted with the devices fortraining the gun-barrel and that it therefpre needs little space only.This is particularly important in case the gyroscope device is\mountedina narrow spot, for instance the top of the ship. The use of acontinuous current motor for driving the synchronously runningtransmitt'en and receiver offers the further advantage that, firstly,the synchronism will disappear not as easily, owing to the successiveincrease of the number of revolutions of the continuous current motor,as with the drive by hand which is not uniform owing to its nature. 130

, indicating device a the adjustment, according to the range of the stament is the same is t atof the Secondly the conditions may be so chosenthat the starting time of the motor becomes constant.

The second embodiment differs from that described onl by the apparatussituated in the transmitter station. 5

For driving the shaft f fitted with the f f serve; in a "manner exactlycorresponding to the first embodi ment, a hand wheel f and a continuouscurrent motor F positively connected to the shaft f by means of areleasable clutch i The brushes 9, however, forming the retative part ofthe transmitter Gare mounted' directly on the free end of the shaft Thereceiver H, no longer shown (see 'Fig.

1), is situated in the gyroscope station'and is connected to saidtransmitter G by conductors g. The shaft f has mounted on it still aworm f firwhich co-operats with teeth 12 of a sector P swin gly mountedon a frame B. On the sector is mounted for rotation the shaft e fittedwith the hand wheel E and with the reading-ofi' device e e and positivelconnected, in its turn, to another secton. y means of a self-lockingworm gear e. 8 This sector s that is swingingly mounted on the sector Pand is coaxial there- I with is positively connected to the shaft 11carrying the brushes (1 of the transmitter D by'mehns of a bevel gear ad. The receiving motor B, likewise no longer, shown see Fig.1, isconnected to the transmitter 1 by the conductors b.

The mode of handlin the second cmbotiiiescribed. It will be seen withoutfurther explanation that every rotation of the-shaft f causes a rotationofthe rotative 1parts In? and'd of the transmitters G -and w e tar ofthe shaft e will rotate only the adjustable part (if of the transmitterD. The

- advantage of the .second embodiment over eral adjustable 1. A firecontrol apparatus 1 the first-described resides in that the planet gearwhich" may cause inaccuracies if not ufactured with extraordinaryprecision, used-with. 4 s both .dedscrilbed embogiments ,possl eto proviet erangea just a 6 still 'with"a second motoric. with insertion of areleasable clutch, which drive continuously impart to the shaft 0 thevariable range 0 f the target.

Qlaims:

for naval guns, comprising the combination with one'o'r sevbarrels ofapointing mechanism, a long distance adjusting device operativelyconnected with said gomting mecha nism for adjusting said gun arrel orBarrels and comprising a transmitter and 'a receiver, said receiverbeing positively connected to said pointing mechanism, an electricfiring trio firing devlce, two coope distance adjustingdevice enablindevice, two cooperating contacts contained insaid firing device andbeing situated in the circuit thereof, a stabilizing nieans for one ofsaid contacts, the other of "said contacts being non-stabilized, a longdistance adjusting device enabling the adjusting of the nonstabilizedcontact of said firing device and comprising a transmitter and areceiver, said repelver being positively connected to saidnon-stabilized contact; and operating means for the transmitters of bothsa'id long distance ad'usting devices, said means adapts ed forternatively settin said gun barrel or barrels either indepen ently ofthe adjustment of said non-stabilized. contact or in common therewith.2. A fire control apparatus for naval guns, comprising the combinationwith one or several adjustable gun barrels of a pointing mechamsm, along distance adjusting device operatively connected with said point-'ing mechanism for adjusting said gun barrel on barrels and comprising atransmitter and a receiver, said" receiver being positively connected tosaid pointing 'inec anism, an electricfiring device, ,two cooperatingcontacts in said firing deviceand bein situated in the circuit thereof,a. gyroscopic evice for tabi: lizing one 'of said contacts, the other ofsaid contacts being non-stabilized, a long dis- 95 tance adjustingdevice enabling the adjusting, of thenon-stabilized contact of saidfiring device and comprising aatransmitte'r and a. receiver, saidreceiver being dpositively connected to said non-stabilize contact; andoperating means for the transmitters of both said long distanceadjusting devices, said means being adapted foralternatively settingsaid gun barrel or barrels either independent] of the adjustment of saidnon-,

contact or in common therewith. 3, A fire control apparatus for navalguns, comprising-the combination with one pr sev era lad'ustable gunbarrels of a, pointing "mechanism, a long distancp adjusting device-operatively connected ',w1th said pointing mechanism for adjusting-saidgun ba lor barrels and comprisin a transmitte' and a receiver, saidreceiver ing positively' cons nected to said inting mechanism,"an leccontacts r'at'. contained insaid firing device an ii bemigzsit- 'uatediii the circuit thereof, a stabi ing means for one of said contacts, theother of i said contacts being non-stabilised, a lonf' 12o gsthg ajusting of th e non-stabilized contac o said ,firing device andcomprisin \a transmitter and a receiver; said receiver ing posit' 1 lconnected to said non-stabilized-gaontact; and

,operating means for the transmitters of both said 1o distanceadjustingidevices, said means be adapted for alternatively setting saidgun barrel or barrels ,elther independ;

ently of the adjustment ;of said non-stabiL' 3 45 contained in saidfirin ized contact or in common therewith aiid comprising a motor drivenshaft in operative Y connection with both of saidtransmitters,

and a hand operated shaft in operative .con- I nection with said firstnamed transmitter andenabling the independentadjustment of said gunbarrel or barrels.- 4. A firecontrol apparatus for naval guns,'comprisiii the combination with orie or ,several adjustable gun barrelsof a pointing mechanism, a long distance adjusting device operativelyconnected .with said pointing mechanism for adjusting said gun barrel orbarrels and comprising atransmitter and a receiver, said receiver beingpositively connected to said pointing mechanism,-an electricfiring-device, two cooperating contacts contained. in said firing deviceand being ."situated-inthe circuitthereof, a stabilizing means for oneof said contacts, the other of said contacts being non-stabilized, along distance adjusting devicerenabling the adjusting oi thenon-stabilized contact of said firing device and comprising atransmitter and areceiver, said receiver being positively connected tosaid non-stabilized contact; and operating means tor the transmitters ofboth said long? distance adjusting -devices, said means comprising two'separate driving means, ,one of said driving means being 01 eratively'connected to the transmitter of said first named long distance adjustingde-- vice and the other being operatively-connected-to both of saidtransmitters. s 5. A fire control apparatus for naval guns, "cbmprisingthe combination with one or several adjustable gun barrels .oi'apointing mechamsm,a long distance adjusting device operatively connectedwith said pointing '40 mechanism for adjusting said gun barrel or"barrels and comprising a transmitter and a I operatively connected withsaid mechanism for adjustingilzsaid gun barrel or barrels and comprisingatransmitter and a receiver, said receiver being positivelyconnected tosaid pointing mechanism, an electric firin device, two coo cratingcontacts containe in said firin evice and being situated in the circuitt ereof, a stali' means for one of said contacts, the other 0 saidcontacts being non-stabilized, a long [6. distance adjusting deviceenabling the. adjusting of the non-stabilized contact of said firing"device and comprising a transmitter. and a receiver, said receiver beingpositively connected to said non-stabilized contact; op-- crating meansfor the transmitters of both said lon distance adjusting devices, saidmeans being adapted for alternatively setting said gun barrel or barrelseither inde end-' erftly of the adjustment of said non-stabilizedcontact or in common therewith; and a long distance indicating deviceembodying a transmitter, a recelver positioned at one of said gunbarrels, means connecting said transmitter to said receiver forsynchronous operation, and a pointer carried by said re ceiver, saidtransmitter being operated in, conjunction with the transmitter of saidfirst-named long distance adjusting device.

7 A fire control a paratus for naval guns," comprising the com inationwith one or-several adjustable gun barrels of a pointing I mechanism, along distance adjusting. device operatively connected with said pointingmechanism for adjustingsaid gun barrel or. loo barrels and comprising atransmitter and a receiver, said receiver being positively con nected tosaid pointing mechanism, an electric fir' device, two cooseratingcontacts containe in said firin evice and being situated in the circuitt ereof, a stabilizin receiver, said receiver being positively conmeansfor one of said contacts, the other 0 nected to said pointing mechanism,an electric firing device, two cooperating contacts device and beingsituated in the circuit t erect, a stabilizing r means for one of saidcontacts, theother of- ;said contacts being non-stabilized, a longdistance adjusting device'enabling the ad- 5o justihg dithenon-stabilized contact of id g device .and comprising a transml ter Qand arcceiver, said receiver, being positively connected to saidnon-stabilized'contact {and operating meansflfor the transmitters ofboth 'stabilize 66 said long distance adjusting 'devices, said meanscomprising two shafts, eac'h connected with. one of said transmitters,athird shaft J arid a hand-wheel fixed thereto, a direct ourrent-.motogand a clutch; said motor-being J69 adapted to beoperativelyponnectedto said thirdshaftbymeans-of said-clutch. f g f 6. Afire control apparatus for naval guns,

' comprising the -combination -With oneor sev em1 ;..ea aaas1e barrelsof a painting t5 a long distance adjusting device said contacts beingnon-stabilized, a lon distance adjusting fining device and comprisinavtransmitter and a receiver, said-receiver eing positively connected tosaid non-stabilizedjcon troprating means for the tr 'bothfl said longdistance adjusting devices} said 115 means being adapted foralternatively ting said gun barrel or barrels either inde-a, pendentl Weadjusting ofi-is'aid non-.3,

cont t 0 common therewith? 'nd alongdistan indicating zdevicejem i yinga transmitterfa receiver positioned at one of said gun barrels, means cosaid transmitter to said f 'iver to synchronous operation,-anda po' 'tercarried h said receiver;- a7 counter-markoperativ connectedto said poin-mephanism cooperating with. said-pointer, .sai d transv being 'operatedm conjun tron with the transmitterof said first-11am'longdistancadjusting' device. I

device enabling. the a justing of the non'stabilized contact of said not8. fire control a paratus for naval guns,

an additional adjustment to said pointing comprising the com inationwith one or sevmechamsm upon the disengagement of said eral adjustablegun barrels of a pointing mechamsm, a long distance adjusting deviceoperatively connected with said pointing mechanism for adjusting saidgun barrel or barrels and comprising a transmitter and a receiver, atransmission shaft interposed between said receiver and said pointingmechanism, clutch means interposed in said shaft, an electric firingdevice, two cooperatin contacts contained in said firing device an beingsituated in the circuit thereof, a stabilizing means for one of saidcontacts, the other of said contacts being non-stabilized, a longdistance adjusting device enabling the 'adjusting of the non-stabilizedcontact of said firing device and comprising a transmitter and areceiver, said receiver eing positively 20 connected to Saidnon-stabilized contact; op-

erating means for the transmitters of both said long distance adjustingdevices, said -means being adapted for alternatively setting'said gunbarrel or barrels either independentl of the adjustment of saidnonstabiliae contact or in common therewith a long distance indicatingdevice embodying a transmitter, a receiver ositioned at one of said: gunbarrels, means connecting said transmitter to said receiver forsynchronous operation, and a pointer carried by said receiver, saidtransmitter being operatediin conjunction with the transmitter of said-named long distance adjustin device, a counter mark controlled by saids aft and cooperaling with said pointer and a handwheel carried by saidshaftfor imparting clutch means. Q

9. A fire control apparatus for naval guns, comprising the combinationwith one or several adjustable gun barrels of a pointing mechanlsm, along distance adjusting device operatively connected with said 1pointing mechanism for adjusting said gun barrel or barrels andcomprising a transmitter and a receiver, said-receiver being positivelyconnected to said pointing mechanism, an electric firin device, two cooeratingcontztcts ,oontaine in said firing evice and being situated inthe circuit thereof, a stabilizing means for one of said contacts, theother of said contacts being non stabilized, a long distance adjustingdevice enabling the adjusting of the non-stabilized contact of saidfiring device and comprising a transmitter 'and a receiver, saidreceiver being positively connected to said non-stabilized contact; andoperating means for the transmitters of both said long distanceadjusting devices, said means embodying two' shafts operativelyconnected each to one of said transmitters, a sunand -planet gear unitconnecting said shafts; whereby the movement of one of said shafts isimparted to the other and a third .shaft ,inconnection with said sunand;i -planet gear unit and enabling the adjust ment of said gun barrelcontrolling trans--"- mitter independently .of said non-stabilized,contact controlling transmitter. W

The foregoing specification signed 'at Berlin, Germany, this 9th day ofFebruary, 1924.

WALTHER

